UC configuration - similar to the classic Oldham coupling, but with a torque-transmitting element that's round in cross-section, rather than rectangular, allowing pivoting similar to a universal joint.

UI configuration - a higher torque, higher stiffness variation without the mechanical fuse protective function. Cylindrical fins overlap, with the axes of the two cylinders intersecting, allowing for pure universal action and smooth angular flexion, while still accommodating a large radial misalignment.

Advantages of OEP's Oldham/Universal over other manufacturers' couplings with similar designs:

Higher torsional stiffness, longer service life, and more consistent performance from one coupling to another due to much tighter machining tolerances, better surface finishes, and one-piece hubs machined from bar

Higher static break torque and higher peak torque due to small but critical geometrical features, details of fabrication techniques, and the use of advanced materials and processes

Higher RPM rating because of dynamic balance inherent in every coupling